I own one female. She's about 5' now, but still growing. I'd keep the whole enclosure pretty humid. I keep mine on prococo (coconut chunks). I'd also suggest providing a water bowl big enough for the BRB to soak in. Mine will regularly soak, even with humidity around 75%...It is how I know humidity has dropped some and I need to re-mist or moisten the substrate.

Very secluded during the day, active at night. Good feeding response. Some can be hard to tame down (I've been told) but mine has never given me any problems.